Can someone help please ? :(

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Which of the following tables represents exponential functions?

What is the explicit formula for this sequence? -7, -4, -1, 2, a.) an = 8 + (b - 1)3 b.) an = -7 + (n - 1)3 c.) an = 3 + (n -1) (-7) d.) an = -7 + (n - )